Fix a bunch of other low-hanging style lints (#36498)

- **Fix a bunch of low hanging style lints like unnecessary-return**
- **Fix single worktree violation**
- **And the rest**

Release Notes:

- N/A

crates/file_finder/src/file_finder.rs

@@ -878,9 +878,7 @@ impl FileFinderDelegate {
                 PathMatchCandidateSet {
                     snapshot: worktree.snapshot(),
                     include_ignored: self.include_ignored.unwrap_or_else(|| {
-                        worktree
-                            .root_entry()
-                            .map_or(false, |entry| entry.is_ignored)
+                        worktree.root_entry().is_some_and(|entry| entry.is_ignored)
                     }),
                     include_root_name,
                     candidates: project::Candidates::Files,

crates/file_finder/src/open_path_prompt.rs

@@ -728,7 +728,7 @@ impl PickerDelegate for OpenPathDelegate {
                         .child(LabelLike::new().child(label_with_highlights)),
                 )
             }
-            DirectoryState::None { .. } => return None,
+            DirectoryState::None { .. } => None,
         }
     }